Ftp_nb_fput()

Understanding the PHP Function ftp_nb_fput()

The ftp_nb_fput() function is a built-in PHP function that uploads a file to the FTP server using non-blocking mode. In this article, we'll discuss the function in detail and provide you with a comprehensive guide to using it in your PHP projects.

What is ftp_nb_fput()?

The ftp_nb_fput() function is a PHP built-in function that uploads a file to the FTP server using non-blocking mode. The function takes three parameters:

1. ftp_stream: The connection identifier returned by the ftp_connect() function.
2. remote_file: The remote file path.
3. handle: An open file pointer in the local file system.

The function returns true if the operation was successful. Otherwise, it returns false.

Syntax of ftp_nb_fput()

The syntax of the ftp_nb_fput() function is as follows:

int ftp_nb_fput ( resource $ftp_stream , string $remote_file , resource $handle , int $mode [, int $startpos = 0 ] )

The ftp_nb_fput() function takes three required parameters, ftp_stream, remote_file, and handle, and two optional parameters, mode and startpos. The ftp_stream parameter is the connection identifier returned by the ftp_connect() function. The remote_file parameter is the path to the remote file on the FTP server. The handle parameter is an open file pointer in the local file system. The mode parameter specifies the transfer mode, either FTP_ASCII or FTP_BINARY. The startpos parameter specifies the position in the remote file to start the upload from. By default, startpos is set to 0, which means the upload will start from the beginning of the file.

Usage of ftp_nb_fput()

To use the ftp_nb_fput() function, you first need to establish a connection to the FTP server using the ftp_connect() function. Here's an example:

<?php

// Set up an FTP connection
$conn = ftp_connect('ftp.example.com');

// Login with your FTP credentials
ftp_login($conn, 'username', 'password');

// Open a file for reading
$handle = fopen('local_file.txt', 'r');

// Initiate an asynchronous FTP operation
ftp_nb_fput($conn, 'remote_file.txt', $handle, FTP_BINARY);

// Continue the asynchronous FTP operation
while (ftp_nb_continue($conn)) {
    // Do something else while waiting for the FTP operation to complete
}

// Close the file
fclose($handle);

// Close the FTP connection
ftp_close($conn);

In this example, we establish a connection to the FTP server using the ftp_connect() function. Then we log in using our FTP credentials using the ftp_login() function. We open a file for reading using the fopen() function and initiate an asynchronous FTP operation using the ftp_nb_fput() function. We continue the operation using the ftp_nb_continue() function and close the file and FTP connection.

Error handling in ftp_nb_fput()

It's important to handle errors properly when using the ftp_nb_fput() function. If the function returns false, it means that the upload was unsuccessful. Here's an example of how to handle errors:

<?php

$handle = fopen('local_file.txt', 'r');
$upload_successful = ftp_nb_fput($conn, 'remote_file.txt', $handle, FTP_BINARY);

if (!$upload_successful) {
    echo "Failed to upload file to remote server.\n";
}

while (ftp_nb_continue($conn)) {
    // Do something else while waiting for the FTP operation to complete
}

fclose($handle);
ftp_close($conn);

By handling errors appropriately and checking the return value of the function, you can ensure the success of your FTP operations using the ftp_nb_fput() function.

Conclusion

In conclusion, the ftp_nb_fput() function is a useful tool for uploading files to an FTP server using non-blocking mode. It allows you to continue with other operations while waiting for the FTP upload to complete. By understanding how to use this function, you can efficiently transfer files between your local machine and an FTP server, improving the performance and productivity of your PHP projects. Remember to always handle errors appropriately to ensure the success of your FTP operations.